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On the advanced scan page, select SMA from the Technical Indicators drop down and edit for 10 and 20 sma. The "cross above" operator is "x", so that would go between the two sma expressions.
See this recent question for more on documentation and how the scan language works:
Comments
See this recent question for more on documentation and how the scan language works:
http://scan.stockcharts.com/discussion/1304/doing-simple-math-in-a-scan#latest